Perhaps you should try some spelling variations:
thu sach » tu sach, thuat sach, thuoc sach
hanh hai » thanh hai, nhanh hai, hang hai
sach tu » sach thu, cach tu, sach ty
tu nang » tru nang, tu nong, tu nano
nang xa » nang x, lang xa, nang ma
hieu va » lieu va, hieu qua
va hanh » van hanh, va thanh, va danh
hai cua » thai cua, dai cua, hoi cua
cua tre » cua te, cuu tre, cua triet
cac ho » cac hoc, cac he, bac ho
cac co » cac cong

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach tu nang xa hoi. hieu va ((((cac ho) or (cac hop))) or (cac co)) va hanh hai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach tu nang xa hoi. hieu va ((((cac ho) OR (cac hop))) OR (cac co)) va hanh hai cua tre.
• Adding a wildcard symbol may retrieve word variants: thu sach tu nang xa hoi. hieu va ((((cac ho) or (cac hop))) or (cac co)) va hanh hai cua tre*.